Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5350134 | Applied Surface Science | 2017 | 24 Pages |
Abstract
A non-platinum metal catalyst, MnNx/C was synthesized via the high-pressure pyrolysis route. The combination of X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) studies indicated the presence of Mn in +2 oxidation state surrounded by four N atoms. The peak-to-peak separation (ÎEp) of the more negative peak pair observed for I3â/Iâ redox couple over MnNx/C catalyst was 20 mV lower than that of the Pt catalyst, indicating high reversibility of the redox couple over MnNx/C catalyst. The charge transfer resistance of the MnNx/C electrode, as measured by the impedance spectroscopy, is â¼Â 2 Ω higher than that of Pt, which resulted slightly lower short circuit current (Jsc) value for MnNx/C over Pt, however the fill factor (FF) and power conversion efficiency (PCE) values of MnNx/C was slightly higher and comparable to that of Pt respectively. Hence; replacing Pt with MnNx/C would decrease the cost of DSSCs.
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Authors
Suman Kushwaha, Karthikayini M.P., Guanxiong Wang, Sudip Mandal, Preeti. A. Bhobe, Vijay K. Ramani, K.R. Priolkar, Kothandaraman Ramanujam,